BOSCH HSBIM9 9-Piece Bi-Metal Hole Saws Assorted Kit with SpinLOCK Universal Arbor with Included Carrying Case for General Purpose Applications in Wood, Aluminum, Metal, Plastic Materials

These bosch hole saws are made in China. Case is cheap, & so are the hole saws. Out of round - the larger the hole saw, the more the error. Up to 1.5mm difference in diameter! I saw these tested on y/t... yet I am NOT impressed. Against 3/4" plywood, very poor chip extraction. I had to clean off the teeth twice in order to drill through. Did well against sheet metal, but of course sheet metal is thin.I thought about giving this product a two star review, but they work/worked. Definitely no precision holes here. However, no pilot bits broke, and when the pilot bit went through the sheet metal, the hole saw hit that metal with some force (obviously my fault) - everything's fine.If you don't plan on making a lot of holes, save your money by buying some no-name branded hole saw.There's nothing special here.PS - the 'spinlock' arbor is circular. Therefore it will not work with hole saws that have those two flat edges in their center. (It is most certainly NOT "universal") Also, the design of their 'spinklock' is poor because the arbor often self-tightens the hole saw making it hard to change hole saws - there's no flat edge on the arbor for some slip joints pliers to grab unto while you're trying to remove the hole saw.Knowing what I know now, I would not buy this product.

Not much to say about Bosch products. Work great

This is a great set of hole saws. My only complaint is the set screw broke on mine midway through the job. However I was using them with an impact gun and likely far exceeded what the set screw was designed to handle. (cutting a rubber bushing out of metal sleeve). I can still use the saws, just need to add another nut to hold it on the shaft. The saws are sturdy construction, great set.

Typical Bosch quality. Be aware there there are only six sizes. The case seems to have been made for different saws. Several of the indents are too large. Other than that, there are two sizes of arbor and they fit the standard sizes. Because I got this on (a bit of a ) sale, and I use many hole saws in my business, I think that this set is a good value. Having both arbors is a large plus. You can just add on other sizes of saw as you need them.Warning - if you are not familiar with hole saws, they can be dangerous. Use slow speeds, Never tip and hold tightly to the drill.

Used these on some plywood and drywall, worked very well. Easy to use, sharp, and effective. Bosch is great and trustworthy and this purchase is another example of that. Good luck!